Pronunciation: (spes"u-fis'i-tē), [key]
1. the quality or state of being specific.
2. Biochem., Pharm.the selective attachment or influence of one substance on another, as an antibiotic and its target organism or an antibody and its specific antigen.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.